Neck cushion



FIG. 1 is a perspective view showing the top, front, and left side of the neck cushion according to a second embodiment of my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is rear view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line(s) in the figures indicate parts of the device which are not part of the claimed design. 

CLAIM The ornamental design for a neck cushion, as shown and described. 